When you unlock the factory you can use 5 diamond chests & 4 Orb cubes to upgrade to a Rainbow Chest. To get green orbs you need to demolish an artifact which is annoying.
But I had to try at least once to see what treasure I would get from a rainbow chest.
You also need 17 coins to unlock a chest which you can get from completing bonus missions or exchanging rubies.
Super Bomb was my reward 100% more bomb crates with 15% more power.
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